Performing repeat string operations

Details Performing repeat string operations Performing repeat string operations

2006-08-29

2006-08-29

Tsai, Henry W. H. (Department: 2181)

Electrical computers and digital processing systems: processing

Byte-word rearranging, bit-field insertion or extraction,...

C712S220000

Reexamination Certificate

active

07100029

ABSTRACT:
Performing repeat string operations can include aligning a source data location or a destination data location to a location divisible by a predetermined integer, the aligning including performing a string operation using data having a size equal to the operand size. After aligning, a string operation can be performed using data having a size larger than the operand size. Performing repeat string operations can include issuing a first predetermined number of iterations if an operand size is a predetermined size, and issuing a second predetermined number of iterations otherwise. Performing repeat string operations can include determining that a requested number of iterations in a repeat string operation is within a predetermined multi-number range and issuing exactly the requested number of iterations for any value of the requested number within that range.

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Intel Architecture Software Developer's Manual, vol. 2: Instruction Set Reference, “REP/REPE/REPZ/REPNE/REPNZ—Repeat String Operation Prefix,” pp. 3-404-3-406.
IA32 Intel Architecture Software Developer's Manual, vol. 3: System Programming Guide, pp. 7-10-7-11.

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